Furnace.



D. S. JACOBUS & N. E. LEWIS.

FURNACE.

APPLICATION FILED MAR. 20. 1914.

Patented Nov. 23, 1915 DAVID S. JACOBUS, F JERSEY JERSEY, ASSIGNORS TOTHE BABCOCK JERSEY, A GORBORA'IION OF NEW JERS CITY, AND NATHAN E.LEWIS. 0F PLAINFIELD, NEW & WILCOX COMPANY, OF BAYONNE, NEW EY.

Fortunes.

mouse.

Specification of Letters Patent.

Patented Nov. 23, 11915.

Application filed March 20, 1914. Serial No. 825,943.

- To all whom it may concern:

Be it known that we, DAVID S. JAcoBUs and NATHAN E. Lnwls, citizens ofthe United States, and residing at Jersey City, county of Hudson, andState of New Jersey, and Plainfield, county ofUnion, and State of NewJersey, respectively, have in vented certain new and usefulImprovewardly from wall 12 nearly to the first bank of tubes, said archcomprising sections 11 and 15 separated a suiiicient distance to providean air passage 16. The arches 11 and ll15 are substantially parallel,the latter directing the hot gases into the first bank 'of boiler tubesand into the secondary com bustion chamber above the arch 14-15.

ments in Furnaces, of which the following The outer metal casing 9 iscontinued downis a specification.

Our invention relates to a furnace construction and more particularly toone used in connection with a Stirling boiler.

The features constituting the invention consist in the particulararrangement of the arches and to means for dividing the air for coolingthe arches so as to admit a reguwhich arch vi a standard Stirling boilerinto a water drum 1,- the lated amount above the lower or ignition archof the stoker, and a regulated amount through a passage in the upperdouble arch, directs the hot gases into the first bank of boiler tubes.Q

The invention will be understood by ref; erence to the accompanyingdrawings in which Figure 1 is a longitudinal section of a furnace andboiler illustrating one embodiment and application of the invention, thestoker being shown in broken lines; Fig. 2 a section on. the line 22 ofFig. 3, and Fig. 3 a front view of the air regulating damper.

Similar reference numerals lar parts in the several views.

The invention is illustrated as applied to in which the tubes of thethree banks 1, 2 and 8 are expanded boiler being fired indicate simiby achain gratestoker 5 any approved type. --Water boxes 6 extendlongitudinally ofthe stoker and these are connected to the boilercirculation through pipes 7 and 8. The boiler parts are inclosed withinthe usual walls, the front wall comprising an outer metal casing 9.

The furnace chamber 10 is constructed w h the usual ignition arch 11which extends outwardly from the front wall of the setting. Above theinner end of the ignition arch is built a curtain Wall 12, the arch 11and wall 12 being spaced apart a sufficient distance to provide an airpassage 13.1 Forming the roof which may be of the air from the outsideenters between casing9 and th {11, and in front of the 7 and in flowingthrough the passages 13 and Ward so as to inclose the front ends andside of arches l4 and'15 and wall 12, and the exposed portionvof arch11, said casing being separated from the brick-work to provide a spacefor the admission of air through suitable openings therein. The spaceoutside of the arches and curtain wall is closed at its lower end bybrick-work 11 and at its upper end by an angle plate 17. To divide orseparate-the air to be delivered through the passages 13 and 16 weintroduce a seal 18, which may be asbestos packing, in the space betweenthe front of wall 12 and cas- 19, and

between the tpp of wall 12 and arch 14.. The air to he-delivered throughthe passages 13 and 16 is admitted to the space inside of casing 9through openings 19 formedin said casing,and to regulate the amount ofenteringair we provide a damper 20 having openings corresponding toopenings'19 and adapted-t0 be moved between suitable guides to close theopenings 19 more or less as may be desired. By this means the air isdistributed evenly across the width of the setting.

In operation, with the dampers 20 open, the spaces e upperlside of archdouble arch 14-15,

16 cools the arches.

of the main combustion chtllmber is a double arch extending in--.

In practice we have found that by employing the arrangement describedthe arches can be maintained under conditions where ordinary archeswould fail. Practically the full furnace temperature is maintained byreason of the heating of the air in passages 13 and 16, and completecombustion effected both in the main chamber 10 and the secondarycombustion chamber abovearch 14-1 5. The amount of air admitted is suchthat it does .not interfere with the economy of the boiler; in fact,there are beneficial efi'ects imizing of smoke.

through the min- \Vhat we claim and desire to e ure by Letters Patentot' the l nited States is 1. boiler furnace having a tuel support, acurtain wall over the support. an igji'iition arch extendingoutwardl vfrom the curtain wall over the file] support. an upper arch extendinginwardly from the curtain wall toward the boiler tubes, said upper archhaving a. passage for the admission of air to the furnace chamber, anair passage be ing provided above the lower external. arch and separatedfrom the air passage for the upper arch. and each of the said airpassages havingits outlet to the combustion chamber at the rear end ofits respective arch.

2. A boiler furnace having a fuel support. a curtain wall over thesupport. an ignition arch extending outwardly from the curtain wall'overthe fuel support. an upper arch extending inwardly from the curtain walltoward the boiler tubes. said upper arch having a passage for theadmission of air to the furnace chamber. an air passage being providedabove the lower external arch and separated from the air passage for theupper arcln each of the said air passages having its outlet to thecmnbustion chamber at the rear end of its respecti e arch. and means forregulating the admission of air to said passages.

3. A boiler furnace havinga fuel si'zpport.

a front wall therefor. an ignition arch extendingoutwardly from thefront wall over the fuel support. an air inlet passage over saidoutwardly extending arch an. upper arch extending inwardl from the frontwall toward the boiler tubes. said upper arch beingof double form withair ventilation between. the two portions thereof. and each of the saidair passages having its outlet to the combustion chamber at the rear endof the arch.

-'l. A boiler furnace hai ing a fuel support, a front wall therefor. anignition arch eX- tcnding outwardly from the front wall over the fuelsupport, an air inlet passage over said outwardly extending arch anupper arch extending inwardl from the front wall toward the boilertubes. said upper arch being of double form with air ventilation betweenthe two portions thereof. the air passages being separated from eachother and having; means for independent regulation.- and each having itsoutlet to the combustion chamber at the rear end of the arch.

In testimony whereof we have hereunto signed our names in the presenceof two subscribing witnesses.

Y DAVID S. JACOBUS. NATHAN E. LEWIS.

\Yitnesses E. P. TERRY. llDI'IH (.rnr.

